Horia Grosu

Study Concerning the Dynamic of Body Size with Bioeconomic and Ecoeconomic Value, Followed in Objective Improvement of Carp Populations

Genetic progress per generation depends on heritability, number of considered traits and also the correlations among them. Concerning fish breeding programmes, one of the major problems is the selection for the body shape, which affect the meat production. Studying the evolution of body size during growth process, based on race and age, help in decision making regarding the establishment of selection criteria and operation of the race with the best development. A group of individuals of three different carp breeds composes the biological stuff used in this experiment: Frasinet, Ineu, Ropsa. The research was made on five lots of one summer age spawn belonging to five families. Each lot was made of fifty individuals. The individuals were measured, consequently, three years, in terms of the body length (l), maximum body height (H). Data on phenotypic manifestation of the characters studied were processed statistically, applying the Fisher (F) and Tukey (w) significance tests. The body length doesn’t have significant differences between the Frasinet and Ropsa breeds in the first and third summer age; in the second summer age individuals of Ropsa breed differed significantly from Frasinet and Ineu (F =133.54; w=9.01). The maximum body height, after the first summer age, recorded the highest value to Ineu (56.60 mm). After the third summer age, individuals of Ropsa breed differ significantly from other (F =114.10; w=6.17). The H/l ratio recorded the highest values in individuals belonging to the Ineu breed throughout the growing period, which implies a higher meat production recovery.